Not a fifth lens, but the point the whole engine exists to make: historians describe the same country differently because they weigh its causes differently.
The origin of Peru’s recurring instability is the sharpest dispute. The consensus and economic-geographic readings treat the coast–highland split as a structural inheritance — a state built on one geography governing peoples and terrain it never fully absorbed. The revisionist reading agrees the split is real but insists it was never simply endured: Andean and plebeian communities have repeatedly organised, rebelled, and forced concessions rather than passively awaiting integration from Lima. Same divide, opposite emphasis: a gap imposed from above, or a frontier actively contested from below.
The internal war of 1980–2000 divides the lenses in a similar way. The cultural-political account traces Sendero Luminoso’s appeal to a long-unresolved question of who belongs fully to the nation, and to the near-religious intensity of its Maoist doctrine; the economic-geographic account traces it to the poverty and neglect of highland communities left out of successive resource booms; the revisionist account stresses the agency of the peasant self-defence militias that ultimately helped the state defeat it, rather than treating victory as achieved from above alone. Each explanation fits the same war, and each locates its cause, and its resolution, differently.
On one point all four perspectives agree: the Peruvian state was declared from the coast, in 1821, well ahead of any shared national identity capable of uniting the country it claimed. They part on what, if anything, has since done the binding — institutions and elite management, popular struggle from below, a contested cultural and religious argument over belonging, or the geography and resource booms that keep reproducing the same coastal centre and neglected interior.
Reference status: every work cited is verified and correctly attributed — Peter Klarén, Peru: Society and Nationhood in the Andes (2000); Orin Starn, Carlos Iván Degregori & Robin Kirk (eds.), The Peru Reader (2nd ed., 2005); Steve J. Stern, Peru’s Indian Peoples and the Challenge of Spanish Conquest (1982); Cecilia Méndez, The Plebeian Republic (2005); Florencia Mallon, Peasant and Nation (1995); Charles F. Walker, The Tupac Amaru Rebellion (2014); José Carlos Mariátegui, Seven Interpretive Essays on Peruvian Reality (1928; trans. 1971); Sabine MacCormack, Religion in the Andes (1991); Alberto Flores Galindo, In Search of an Inca (2010; orig. 1986); John V. Murra, Formaciones económicas y políticas del mundo andino (1975); Paul Gootenberg, Between Silver and Guano (1989); Javier Pulgar Vidal, Geografía del Perú: Las Ocho Regiones Naturales. Flores Galindo’s Andean-utopia thesis and Murra’s verticality model are both influential but actively debated interpretations, and are presented here as such.